When we set out to make our unstructured Ludlow—our lightest ever—we wanted it to look like a blazer but feel like a T-shirt. To that end, we partnered with Somelos, an expert mill in Portugal (a country that's no stranger to sun-filled days), to weave an incredibly breathable cotton-linen fabric. Then we cut it in our famous slim Ludlow silhouette without any of the usual canvasing or padding you'd find in a suit. It's the most versatile jacket a guy can own—from business casual to a weekend away.